a = "bar@n@baz"                 -- FAIL
a = "bar@r@baz"                 -- FAIL
a = "bar\n\r\t@t@baz"
a = "bar\80baz\a\80\0foo"
a = "bar\f\v\bbaz"
a = "bar@f@@v@@b@az"
a = '\\'
a = '\''
a = '\['
a = '\123'
a = '\255'
a = '\256'                      -- FAIL
a = '\300'                      -- FAIL
a = [[bar\f\v\bbaz]]
a = [[\]]
a = '\z \x'
// { "luaVersion": "5.2" }
a = '\['                        -- FAIL
a = '\x23'
a = '\x0'                       -- FAIL
a = '\x0x'                      -- FAIL
a = '\xx'                       -- FAIL
a = "bar\z    baz"
// { "luaVersion": "5.3" }
a = '\u{0}'
a = '\u{1f4a9}'
a = '\u{7f}\u{80}'
a = '\u{7ff}\u{800}'
a = '\u{ffff}\u{1f4a9}'
a = '\u{10ffff}'
a = '\u{110000}'                -- FAIL
a = '\u{120000}'                -- FAIL
a = '\u{000000001f4a9}'
a = '\u{100000001f4a9}'         -- FAIL
a = '\u{1f4a9'                  -- FAIL
a = "\u{1f4a9"                  -- FAIL
a = '\uaa'                      -- FAIL
a = '\u{}'                      -- FAIL
a = '\u{0g}'                    -- FAIL
